new.kt

enum class Theme(val storageKey: String) {
    LIGHT("light"),
    DARK("dark"),
    SYSTEM("system")
}

// initialization DataStore with extension
private val dataStore: DataStore<Preferences> = context.dataStore

var selectedTheme by PreferenceDataStore<String>(
    dataStore = dataStore,
    key = stringPreferencesKey(name = "pref_dark_mode"),
    defaultValue = SYSTEM.storageKey
)